08Mute toggle — a switch interpolating opacity by its state value

<main class="stage">
<section class="panel">
  <div class="card" id="card">
    <div class="dots"><span class="dot"></span><span class="dot"></span><span class="dot"></span></div>
    <span class="label">Typing</span>
  </div>
  <button class="muteBtn" id="muteBtn" type="button" aria-pressed="false" aria-label="Toggle typing indicator mute">
    Mute
  </button>
  <span class="badge" id="muteBadge" hidden>Indicator off</span>
  <span class="sr" id="live" role="status" aria-live="polite"></span>
</section>
</main>

@use "../../../../site/static/demo-tokens" as *;

@include stage($stage-paper);

.panel {
  display: flex;
  align-items: center;
  gap: $sp-4;
}

.card {
  display: flex;
  align-items: center;
  gap: $sp-2;
  padding: $sp-3 $sp-4;
  border-radius: $r-card;
  background: $subject-ink;
  transition: opacity $dur-base $ease-out;
}

.dots { display: flex; gap: $sp-1; }

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: $subject-cream;
}

.label {
  font-size: 13px;
  color: $subject-cream;
}

.muteBtn {
  padding: $sp-2 $sp-3;
  border-radius: $r-control;
  border: 1px solid $subject-ink;
  background: transparent;
  color: $subject-ink;
  font-size: 13px;
  cursor: pointer;
}

.muteBtn[aria-pressed="true"] {
  background: $subject-ink;
  color: $subject-cream;
}

.badge {
  padding: $sp-1 $sp-2;
  border-radius: $r-xs;
  background: $error-soft;
  color: $error;
  font-size: 12px;
}

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

@media (prefers-reduced-motion: reduce) {
  .card { transition: none; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.panel {
  display: flex;
  align-items: center;
  gap: 16px;
}

.card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-radius: 16px;
  background: #17141a;
  transition: opacity 300ms ease-out;
}

.dots {
  display: flex;
  gap: 4px;
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #fff7e6;
}

.label {
  font-size: 13px;
  color: #fff7e6;
}

.muteBtn {
  padding: 8px 12px;
  border-radius: 12px;
  border: 1px solid #17141a;
  background: transparent;
  color: #17141a;
  font-size: 13px;
  cursor: pointer;
}

.muteBtn[aria-pressed=true] {
  background: #17141a;
  color: #fff7e6;
}

.badge {
  padding: 4px 8px;
  border-radius: 4px;
  background: #ffe0d8;
  color: #c2361a;
  font-size: 12px;
}

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

@media (prefers-reduced-motion: reduce) {
  .card {
    transition: none;
  }
}

// 표시 끄기 토글 — 상태 값(켜짐/꺼짐)만큼 카드의 투명도를 보간하고, 꺼짐 표시는 별도 배지로 대비를 지킨다.
// 계산 겹: 상태 값 → 목표 투명도 재계산 → transition 으로 보간. 클릭 리스너 1개(이 항목만).
(function () {
  var btn = document.getElementById('muteBtn');
  var card = document.getElementById('card');
  var badge = document.getElementById('muteBadge');
  var live = document.getElementById('live');
  if (!btn || !card || !badge || !live) return;

  var OFF_OPACITY = 0.3;
  var AUTO_CYCLE_MS = 700;
  var muted = false;

  function apply() {
    card.style.opacity = muted ? String(OFF_OPACITY) : '1';
    badge.hidden = !muted;
    btn.setAttribute('aria-pressed', String(muted));
    live.textContent = muted ? 'Indicator off' : 'Indicator on';
  }

  btn.addEventListener('click', function () {
    muted = !muted;
    apply();
  });

  apply();
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  if (reduce) return;
  setInterval(function () {
    muted = !muted;
    apply();
  }, AUTO_CYCLE_MS);
})();

import { useEffect, useRef, useState } from "react";
import styles from "./TypingMuteToggleFade.module.scss";

// 표시 끄기 토글 — 상태 값(켜짐/꺼짐)만큼 카드의 투명도를 보간하고, 꺼짐 표시는 별도 배지로 대비를 지킨다.
// 계산 겹: 상태 값 → 목표 투명도 재계산 → transition 으로 보간. 클릭 리스너 1개(이 항목만).
const OFF_OPACITY = 0.3;
const AUTO_CYCLE_MS = 700;

export default function TypingMuteToggleFade() {
  const [muted, setMuted] = useState(false);
  const liveRef = useRef<HTMLSpanElement | null>(null);

  useEffect(() => {
    if (liveRef.current) {
      liveRef.current.textContent = muted ? "표시 꺼짐" : "표시 켜짐";
    }
  }, [muted]);

  useEffect(() => {
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    if (reduce) return;
    const id = setInterval(() => setMuted((m) => !m), AUTO_CYCLE_MS);
    return () => clearInterval(id);
  }, []);

  return (
    <div className={styles.stage}>
      <section className={styles.panel}>
        <div
          className={styles.card}
          style={{ opacity: muted ? OFF_OPACITY : 1 }}
        >
          <div className={styles.dots}>
            <span className={styles.dot} />
            <span className={styles.dot} />
            <span className={styles.dot} />
          </div>
          <span className={styles.label}>입력 중</span>
        </div>
        <button
          type="button"
          className={styles.muteBtn}
          aria-pressed={muted}
          aria-label="입력 표시 음소거 전환"
          onClick={() => setMuted((m) => !m)}
        >
          음소거
        </button>
        {muted && <span className={styles.badge}>표시 꺼짐</span>}
        <span ref={liveRef} className={styles.sr} role="status" aria-live="polite" />
      </section>
    </div>
  );
}